演示地址:http://www.corange.cn/demo/3729/index.html
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312" />
<title>仿切片滤镜的JS焦点图</title>
<style type="text/css">
*{margin:0;padding:0;border:0;list-style:none;}
body{font:12px/1.5 Verdana, Geneva, sans-serif;background:#eee;padding:20px;}
/*=========mF_liuzg ========*/
.mF_liuzg{position:relative;width:450px;height:296px;overflow:hidden;font:12px/1.5 Verdana,Geneva;background:#fff;}
.mF_liuzg .loading{position:absolute;z-index:9999;width:100%;height:100%;color:#666;text-align:center;padding-top:90px;background:#fff url(../loading.gif) center -40px no-repeat;}/*载入画面*/
.mF_liuzg .pic li{width:450px;position:relative;overflow:hidden;*margin-top:-2px;}
.mF_liuzg .pic li p{width:450px;position:absolute;}
.mF_liuzg .pic li p a{display:block;}/*图片和焦点图框架一样大小*/
.mF_liuzg .pic li p img{width:450px;height:296px;}
.mF_liuzg .txt li{position:absolute;z-index:2;bottom:0;width:450px;height:36px;line-height:34px;overflow:hidden;display:none;}
.mF_liuzg .txt li a{display:block;color:#fff;padding:2px 0 0 16px;font-size:14px;font-weight:bold;text-decoration:none;}/*标题样式*/
.mF_liuzg .txt-bg{position:absolute;bottom:0;z-index:1;width:450px;height:36px;overflow:hidden;background:#000;filter:alpha(opacity=40);opacity:0.4;}/*标题背景*/
.mF_liuzg .num{position:absolute;z-index:3;bottom:6px;right:8px;color:#333;}/*按钮样式*/
.mF_liuzg .num li{float:left;width:22px;height:18px;position:relative;border:1px solid #333;line-height:18px;text-align:center;margin-right:3px;cursor:pointer;background:#aaa;filter:alpha(opacity=90);opacity:0.9;}
.mF_liuzg .num li.current,.mF_liuzg .num li.hover{background:#f60;color:#fff;font-weight:bold;height:20px;line-height:20px;top:-2px;}
</style>
<script type="text/javascript">
var myFocus={
//Design By Koen @ 2010.8.x
//http://hi.baidu.com/koen_li
$:function(id){return document.getElementById(id);},
$$:function(tag,obj){return (typeof obj=='object'?obj:this.$(obj)).getElementsByTagName(tag);},
style:function(obj,style){return (+[1,])?window.getComputedStyle(obj,null)[style]:obj.currentStyle[style];},//getStyle简化版
easeOut:function(t,b,c,d){return -c*((t=t/d-1)*t*t*t - 1) + b;},
move:function(obj,prop,val,type,spd,fn){//运动函数，spd为运动需要的时间，时间越大速度越小
var t=0,b=parseInt(this.style(obj,prop)),c=val-b,d=spd||50,st=type,m=c>0?'ceil':'floor';
if(obj[prop+'Timer']) clearInterval(obj[prop+'Timer']);
obj[prop+'Timer']=setInterval(function(){
if(t<d){obj.style[prop]=Math[m](myFocus[st](++t,b,c,d))+'px';}
else {clearInterval(obj[prop+'Timer']);fn&&fn.call(obj);}
},10);return this;
},
addList:function(obj,cla,x){//生成HMTL,cla为列表的class,其中封装有:cla='txt'(生成alt文字),cla='num'(生成按钮数字),cla='thumb'(生成小图)
var s=[],n=x||this.$$('li',this.$$('ul',obj)[0]).length,num=cla.length;
for(var j=0;j<num;j++){
s.push('<ul class='+cla[j]+'>');
for(var i=0;i<n;i++){s.push('<li>'+(cla[j]=='num'?(i+1):(cla[j]=='txt'?this.$$('li',obj)[i].innerHTML.replace(/\<img.*?\>/i,this.$$('img',obj)[i].alt):(cla[j]=='thumb'?'<img src='+(this.$$('img',obj)[i].getAttribute("thumb")||this.$$('img',obj)[i].src)+' />':'')))+'<span></span></li>')};
s.push('</ul>');
}; obj.innerHTML+=s.join('');
},
setting:function(par){
if(window.attachEvent){window.attachEvent('onload',function(){myFocus[par.style](par)});}
else{window.addEventListener('load',function(){myFocus[par.style](par)},false);}
},
mF_liuzg:function(par){
var box=this.$(par.id),boxH=box.offsetHeight,t=par.time*1000;
this.addList(box,['txt-bg','txt','num']);
var pic=this.$$('li',this.$$('ul', box)[0]),n=pic.length;
var c=boxH%par.chip?8:par.chip,h=boxH/c,pics=[];
for(var i=0;i<c;i++){
pics.push('<li><p>')
for(var j=0;j<n;j++) pics.push(pic[j].innerHTML);
pics.push('</p></li>')
}
this.$$('ul', box)[0].innerHTML=pics.join('');
var ul=this.$$('ul',box),txt=this.$$('li',ul[2]),btn=this.$$('li',ul[3]),pic=this.$$('li',ul[0]);
for(var i=0;i<c;i++){//初始化样式设置
this.$$('p',pic[i])[0].style.top=-i*h+'px';
pic[i].style.height=h+'px';
this.$$('p',pic[i])[0].style.height=boxH*c+'px';
}
var index = 0;//开始显示的序号
box.removeChild(this.$$('div',box)[0]);
var run = function(idx) {
var tt=par.type==4?Math.round(1+(Math.random()*(3-1))):par.type;//效果选择
btn[index].className = '';
txt[index].style.display='none';
if(index==n-1) index=-1;
var N=idx!=undefined?idx:index+1;
var spd=tt==2?20:(tt==1?80:Math.round(20+(Math.random()*(80-20))));
for(var i=0;i<c;i++){
if(tt==3) spd=Math.round(20+(Math.random()*(80-20)));
myFocus.move(myFocus.$$('p',pic[i])[0],'top',-N*c*h-i*h,'easeOut',spd);
spd=tt==2?spd+10:(tt==1?spd-10:spd);
}
btn[N].className = 'current';
txt[N].style.display='block';
index = N;
}
run(index);
var auto=setInterval(function(){run()},t);
for (var j=0;j<n;j++){
btn[j].j=j;
btn[j].onclick=function(){if(!this.className) run(this.j)}
}
box.onmouseover=function(){clearInterval(auto);}
box.onmouseout=function(){auto=setInterval(function(){run()},t);}
for(var i=0,lk=this.$$('a',box),ln=lk.length;i<ln;i++) lk[i].onfocus=function(){this.blur();}//去除虚线框
}
};
myFocus.setting({
style:'mF_liuzg',//style为风格样式，
id:'myFocus',//焦点图ID
chip:8,//图片切片数量，能被焦点图的高整除才有效，默认为8片
type:4,//切片效果，1为甩头，2为甩尾，3为凌乱，4为随机效果
time:4//每帧图片时间间隔
});//更多样式设置留意myFocus正式版
</script>
</head>
<body>
<div id="myFocus" class="mF_liuzg">
<div class="loading"><span>请稍候...</span></div><!--载入画面-->
<ul class="pic"><!--内容列表-->
<li><a href="#"><img src="../demo1.jpg" alt="图片1来源于网络，版权属于原作者www.corange.cn" /></a></li>
<li><a href="#"><img src="../demo2.jpg" alt="版权属于原作者，图片2来源于网络" /></a></li>
<li><a href="#"><img src="../demo3.jpg" alt="图片3来源于网络，版权属于原作者" /></a></li>
<li><a href="#"><img src="../demo4.jpg" alt="版权属于原作者，图片4来源于网络" /></a></li>
</ul>
</div>
</body>
</html>
原文地址:http://www.corange.cn/archives/2010/11/3729.html
